What makes the sound when my knuckles crack?

You are welcome to listen in as I "explain things scientific". I have had great fun with lasers, robots and absorbing Quantum Physics.  Now as a classroom teacher, laid low by heart surgery its time to pick yourself up, dust yourself off and give it all you've got. "And in the mean time keep on doing science"

Natural Sciences

You are welcome to listen in as I "explain things scientific". I have had great fun with lasers, robots and absorbing Quantum Physics. Now as a classroom teacher, laid low by heart surgery its time to pick yourself up, dust yourself off and give it all you've got. "And in the mean time keep on doing science"

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What makes the sound when my knuckles crack?

What makes the sound when my knuckles crack?